Inclosed non-arcing refillable fuse



A. A. WELLS.

iNCLOSED NON-ARCNG REFILLABLE FUSE.

APPLICATION man MAY 24, 1919.

1,337,806. Patented Apr. 20, 1920.

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A TTORNEYS T FTSE.

ALBER'I'A. WELLS, OF DETROIT, MICHIGAN.

` INCLOSED NON-ARCING REFILLABLE FUSE.

Application filed May 24, 1919.

T0 all 'whom it mag/.concern "Be it knownthat'I, ALBERT A. VELLs, acitizen of the United Staes, and a resident of Detroit, county of/Yfayne, and State of Michigan, have invented a new and Improved,Inclosed Non-Arcing Refillable Fuse, o f which the following is a full,clear, and vexact description.

This invention ielates to fuses, and in particular to a fusible fuseplug of the arc extinguishing type.

An'object of the invention is to provide a fuse plug which willextinguish and choke the flame or arc incident to the fusing of thecurrent conducting material. Tt is also an object of the invention toprovide indicating means for showing that the fuse has been blown and nolonger conducts current.

Further, itis an object and purpose of my invention to provide a fusibleplug withl the aforesaid characteristics which will be comparativelysimple in structure, inexpensive to. manufacture and convenient inapplication therewith.

TWith the above and other objects in view the invention has relation toa certain combination and arrangement of parts, an e5;- ample of whichis described in the following specification, pointed out in the appendedclaims, and illustrated 1n the accompanying drawings, wherein:

Figure 1 shows an elevational view of the fuse.

Fig. 2 shows an end view thereof.

Fig. 3 shows an elevation of the fuse with rthe end caps removedtherefrom.

F ig. 4 shows an end view of Fig. 3.

Fig. 5 shows a longitudinal sectional view of the fuse plug, thesectional view being taken upon the line 5 5 of Fig. 2.

Fig. 6 shows a sectional view taken upon the line 6 6 of Fig. 5.

Fig. 7 illustrates a sectional view taken upon the line 7 7 of Fig. 6.

Fig. S shows a sectional view taken upon the line 8 8 of Fig. 5.

Fig. 9 shows a sectional view of the circuit conducting plug, the viewbeing taken upon the line 6 6 after said fuse element has been fused andthe parts have moved into an arc quenching engagement one with theother.

Referring more in particular to the drawings, the numerals 1 and 2designate a pair of body sections semi-cylindrical in cross section, andplaced together to form an ap- Speeication of Letters Patent.

Patented Apr. 20, 1920.

Serial No. 299,424.

proximately cylindrical fuse member. One of the body sections isprovided with a groove which gradually slopes downwardly from the planetoward the cricumference of the body. The other body section is providedwith an aperture or slot 4 which opens into the slot 8.

The body sections are placed together with the plane faces thereofadjacent one another, and with a fusible ribbon 5 interposed betweensaid sections. The fusible ribbon turns down at each end as shown at 5a,and lays adjacent the ends of the body sections. A leaf spring 6 isinterposed between the sections, and preferably will lie in contact withthe section 2 and against one surface of the fusible ribbon. Dowel pinsf' are employed for holding the body sections in .fixed position and formaintaining the leaf spring and fusible ribbon in relatively correctposition. The free end of the leaf spring has fixed thereto an arcbarrier plug 9. This barrier plug is provided with an upper wedge shapedend which conforms in shape and size to the walls forming the aperture.4. The barrier plug is provided with a pin 10. The upper end of the pinis sharpened and adapted to puncture a strip of paper 11 which is pastedor otherwise secured to the body section to cover the aperture 4. Thearc barrier plug' is provided with a groove or channel upon either sideof the pin. The fusible ribbon is provided with an aperture forreceiving the wedge shaped extremity 12 of the barrier plug. rThefusible ribbon is reduced in size at the barrier plug so that the ribbonwill burn out or fuse at that point.

End caps 14 are placed over the assembled body sections which securelyhold said sections together.- A screw 15 is screw-threaded into one ofthe body sections and securely engages the metal cap 14 with the turneddown end of the fusible ribbon. The caps 14 provide the circuitterminals of the fuse plug and are adapted to engage a standard form offuse block. The fuse plug will be inserted in the fuse block andwithdrawn in the usual manner.

When the fusible ribbon becomes overly heated due to an excess iow ofcurrent therethrough, the ribbon fuses at the point of greatestresistance, which is adjacent the barrier plug. This causes the tensionof the spring 6 to plunge the barrier plug forwardly into the aperture4. This sudden action on the part of the barrier plug immediately breaksthe arc, and eifectually smothers it out since the barrier plug shoulder12 snugly fits the walls forming the aperture 4. The pin 10 puncturesthe paper strip 1l and indicates that the fuse has been blown, whereuponit is removed and a new plug inserted.

After the fusible ribbon has blown or melted out and thus opens acircuit in which the fuse is inserted, the plug may be removed andrefilled. The refilling is accomplished by removing the screws l5 andend caps 14, after which the two body sections will be separated and anew fusible ribbon 5 inserted therein. Thus this form of fusible plugmay readily be renewed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent is:

1. A fusible plug, comprising in combination; a pair of body sections,joined together with a fusible ribbon inserted therebetween, a leafspring carried within one of the body sections, a barrier plug carriedby the leaf spring and pressing against the fusible ribbon.

2. A fusible plug, comprising in combination; a pair of body sections,joined together with a fusible ribbon inserted therebetween, a leaf'spring carried within one of the body sections, a barrier plug carriedby the leaf spring and pressing against the fusible ribbon, and apuncturing pin provided to indicate that the fuse has been blown.

3. A fusible plug, comprising in combination; a pair of body sectionsplaced together, with a fusible ribbon inserted therebetween, a leafspring, a barrier plug carried on the leaf spring, a strip of paperplaced over an opening formed in one of the body sections, and a pinprovided to be plunged through the paper when theplug fuses.

4. A fusible plug, comprising in combination; a pair of body sectionsjoined together with an aperture formed in one and a slot formed in theother, a leaf spring with one end thereof fixedly disposed between thebody sections and the other end thereof being free to move within theslot, a barrier plug mounted on the free end of the leaf spring adaptedto close the opening in one of the body sections, and a fusible ribbondisposed between the body sections holding the barrier plug out of theopening.

5. A fusible plug comprising, a piece of insulating material providedwith a deep elongated slot formed therein, a leaf spring with one endfixed to the insulating material, a barrier plug mounted on the free endof the leaf spring, a fusible ribbon applied to the insulating materialand having an opening formed therein to permit a portion of the barrierplug to project through said fusible ribbon, another piece of insulatingmaterial provided with an opening placed over the fusible ribbon andhaving an opening to receive the projecting portion of the barrier plug.

ALBERT A. WELLS.

